Bachmann Spectrum HO heavyweight passenger car coupler question

[Paradise275]

Hi.
I've picked a few of these up at train shows  most of which have the couplers missing. I'mm having trouble getting the proper screw to hold # 5 couplers in. The screw that Bachmann used was a self tapping tapered screw that they don't have available.
Any ideas on where to get a screw like this.
Thanks
Rick

[glakedylan]

IIRC 2-56 was a kind of standard for couplers and other applications in HO scale
but to be sure I have not worked with HO for a couple decades
fwiw...